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From: David Xu <davidxu@FreeBSD.org>
Date: Mon, 4 Jan 2010 05:27:49 +0000 (UTC)
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Subject: cvs commit: src/sys/kern kern_umtx.c src/sys/sys _umtx.h umtx.h
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davidxu     2010-01-04 05:27:49 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             kern_umtx.c 
    sys/sys              umtx.h 
  Added files:
    sys/sys              _umtx.h 
  Log:
  SVN rev 201472 on 2010-01-04 05:27:49Z by davidxu
  
  Add user-level semaphore synchronous type, this change allows multiple
  processes to share semaphore by using shared memory area, in simplest case,
  only one atomic operation is needed in userland, waiter flag is maintained by
  kernel and userland only checks the flag, if the flag is set, user code enters
  kernel and does a wakeup() call.
  Move type definitions into file _umtx.h to minimize compiling time.
  Also type names need to be prefixed with underline character, this would reduce
  name conflict (still in progress).
  
  Revision  Changes    Path
  1.75      +160 -2    src/sys/kern/kern_umtx.c
  1.1       +66 -0     src/sys/sys/_umtx.h (new)
  1.34      +12 -36    src/sys/sys/umtx.h